According to www.dynamicgreens.com , it may not be detox at all, but the presence of molds (of course, they are a commercial site, selling their own flash-frozen, outside-grown wheatgrass juice...which by the way tastes delish!...so they have a reason to diss other manufacturers' grass.

I've never had a problem but the person who gave me my first shot(owner of the wonderful cafe LIQUID EARTH) said men have taken one and felt fine at lunch/dinner then when the stand up they've just collapsed...he said its happened a few time over the past 15yrs. I feel good when I take a shot but I guess its a little too much...that seems to pretty much never be a problem with women...goes to show men aren't as tough as they thing they are if they can get knocked down by a small glass of green liquid